mcp-name: io.github.meloliva14/verity-mcp

Verity MCP — verify before you act

The official Model Context Protocol server for VerityLayer: independent, fail-closed trust checks any MCP-capable agent can discover and call. Fact-check a claim, screen for prompt-injection, catch PII, and gate irreversible actions — each check returns a calibrated verdict and abstains rather than guess. Payment is pay-per-call via x402 (USDC on Base mainnet). Verity holds no private key and never charges silently.

Name note: this is VerityLayer's official server — PyPI package verity-mcp, npm package @veritylayer/mcp. The npm package named verity-mcp is an unrelated third-party project.

Tools & pricing (every docstring states its price up front)

Related MCP server: agentfolio-mcp-server

Quickstart

With uv (recommended — Claude Desktop / any MCP client):

{
  "mcpServers": {
    "verity": {
      "command": "uvx",
      "args": ["verity-mcp"]
    }
  }
}

Or with pip:

pip install verity-mcp
verity-mcp        # stdio MCP server

How payment works

Verity's endpoints answer HTTP 402 (Payment Required) until paid. When a tool call hits a 402, this server surfaces it transparently — price restated, x402 challenge attached — so your x402-capable client or proxy can settle the small, disclosed USDC micro-payment and retry. This server never holds a key and never pays on your behalf. verify_receipt is a free route and never 402s.

Signed receipts — don't take Verity's word for it

Every paid verdict ships with an Ed25519-signed receipt: self-contained cryptographic proof of exactly what Verity said about exactly what claim, verifiable forever. Check any receipt free with the verify_receipt tool, offline against the public key at /.well-known/verity-pubkey.json, or live: curl https://api.veritylayer.dev/receipt/selftest.

Configuration (all optional)

Referral tag (reserved)

Every tool accepts an optional affiliate_id, forwarded as an X-Verity-Ref header. It never changes price, gating, or the verdict — it only tags who routed the call, and it is reserved for a future referral program: no split is paid today, and none will be until public terms are published at veritylayer.dev.

Links

• Website: https://veritylayer.dev · Manifesto: https://veritylayer.dev/manifesto/

• Live API + discovery: https://api.veritylayer.dev/llms.txt · /.well-known/x402.json

• npm client: @veritylayer/mcp

• Contact: veritylayer@gmail.com

Independent · fail-closed · keyless · pay-per-call. The only trust form an autonomous agent can pick up mid-task with no human and no account.